WO2017055094A1 - Système d'épuration d'air par oxydation photocatalytique - Google Patents

Système d'épuration d'air par oxydation photocatalytique Download PDF

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Publication number
WO2017055094A1
WO2017055094A1 PCT/EP2016/071850 EP2016071850W WO2017055094A1 WO 2017055094 A1 WO2017055094 A1 WO 2017055094A1 EP 2016071850 W EP2016071850 W EP 2016071850W WO 2017055094 A1 WO2017055094 A1 WO 2017055094A1
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air
photo catalyst
hybrid
air cleaning
cleaning system
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PCT/EP2016/071850
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English (en)
Inventor
Joakim Reimer THØGERSEN
Fei Chen
Chetan Prakash Mittal
Berit HINNEMANN
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Haldor Topsøe A/S
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Publication of WO2017055094A1 publication Critical patent/WO2017055094A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/16—Disinfection, sterilisation or deodorisation of air using physical phenomena
    • A61L9/18—Radiation
    • A61L9/20—Ultraviolet radiation
    • A61L9/205—Ultraviolet radiation using a photocatalyst or photosensitiser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
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    • B01D—SEPARATION
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/88—Handling or mounting catalysts
    • B01D53/885—Devices in general for catalytic purification of waste gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
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    • A—HUMAN NECESSITIES
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    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
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    • B01D2259/45—Gas separation or purification devices adapted for specific applications
    • B01D2259/4508—Gas separation or purification devices adapted for specific applications for cleaning air in buildings
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J35/39—Photocatalytic properties

Definitions

  • the invention relates to an air cleaning system comprising a hybrid photo catalyst arranged for photocatalytic oxidation of pollutants in air, the invention further relates to a method for cleaning air.
  • Air quality in enclosed spaces is often five or more times worse than outdoor air and new technologies will be required to effectively treat the full range of indoor air pollutants.
  • Indoor air contamination is a complex problem and can be classified in three groups:
  • particles as for instance PM2.5 (diameter less or equal to 2.5 ⁇ ) and PM10 (diameter less or equal to 10 ⁇ ) such as very small liquid or solid substances in suspension in the air.
  • PM2.5 diameter less or equal to 2.5 ⁇
  • PM10 diameter less or equal to 10 ⁇
  • particles can include mists, dust, pollen, cigarette smoke, viruses, bacteria, and molds;
  • VOCs volatile organic compounds
  • NOx Oxides of nitrogen e.g. nitric oxide (NO), nitrogen dioxide (NO2)), carbon monoxide (CO), carbon dioxide (CO2) etc.
  • radioactive gases and its progeny such as radioactive gases.
  • PM2.5 and PM10 particles are typically removed by particulate material filters.
  • HEPA High efficiency particulate air
  • ULPA Ultra low particulate air
  • VOCs are the most abundant air pollutants in the indoor air that we breathe.
  • technologies for removal or reduction of VOCs including formaldehyde are still evolving.
  • the field of the present invention is within the field of VOCs removal from indoor air.
  • VOCs released from building materials and furniture are known to be major indoor air contaminants and may cause the well-known 'sick building syndrome' such as headaches, dizziness, nausea, or various allergic reactions.
  • HVAC ven- tilating and air-conditioning
  • VOCs present in smaller amounts can be acetal- dehyde, acetone, 2-butanone, ethanol, n-hexane, limonene, dichloromethane, naphthalene, 2-propanol, propionaldehyde, tetrachloroethylene and others.
  • the level of VOCs in indoor air depends significantly on the sources for VOCs and their emission rates, and can vary widely.
  • the emission of VOCs from building materials has been recognized as the largest source of indoor air pollutants.
  • contributions from outdoor air can also add significantly to the VOCs levels through leakages and makeup air in ventilation systems (see Wang, S., H.M. Ang, and M.O. Tade, Volatile organic compounds in indoor environment and photocatalytic oxidation: State of the art. Environment Interna- tional, 2007. 33(5): p. 694-705).
  • Photocatalytic oxidation is an emerging technology in the HVAC industry and is increasingly being used for oxidative removal of VOCs from indoor air. It has attracted a large amount of attention over the last few decades.
  • PCO In addition to the improvement of Indoor Air Quality (IAQ), PCO has the added potential for limiting the introduction of unconditioned air to the building space, which saves energy.
  • IAQ Indoor Air Quality
  • PCO typically uses short-wave ultraviolet light (UVC), also commonly used for sterilization to energize a catalyst (usually titanium dioxide (T1O2)) and oxidize bacteria, viruses and VOCs.
  • UVC short-wave ultraviolet light
  • T1O2 titanium dioxide
  • PCO units can be mounted to an existing forced-air HVAC system. As PCO itself is not a filtering technology, it is often combined with other filtering technologies for air purification. The most commonly used photocatalyst is T1O2, and to some extent zinc oxide (ZnO).
  • photocatalyst are antimony trioxide (Sb20s), bismuth oxide (B12O3), vanadium oxide (V2O3), ferric oxide (Fe20s), zirconium dioxide (Zr02), tungsten trioxide (WO3), tin dioxide (Sn02), aluminum oxide (AI2O3), cerium oxide (Ce02), zinc sulfide (ZnS), cadmium sulfide (CdS), T1O2 doped with metal ions, T1O2 combined with Zr02 and/or silicon dioxide (S1O2) (see Mo, J., et al., Photocatalytic purification of volatile organic compounds in indoor air: A literature review. Atmospheric Environment, 2009. 43(14): p. 2229-2246).
  • Air humidity may be sufficient or water may need to be added (see Mo, J., et al., Photocatalytic purification of volatile organic compounds in indoor air: A literature review. Atmospheric Environment, 2009. 43(14): p. 2229-2246).
  • NO nitric oxide
  • N2 nitrogen dioxide
  • O2 oxygen
  • the hybrid photo catalyst needs to be able to operate even though the air to be purified contains a mixture of pollutants.
  • PCO photocatalytic oxidation
  • Transient effects may be important both as the air purification system reaches steady- state operation and as the building environment changes diurnally and seasonally.
  • Extended hybrid photo catalyst life is a key parameter to make the photocatalytic oxidation (PCO) technology viable.
  • the adsorbent material should have a good adsorption capacity as well as it should be effective for various ranges of VOCs.
  • One well-known drawback of PCO systems is that the UV sterilization bulbs must be replaced about once a year; in fact, manufacturers may require periodic replacement as a condition of warranty. Therefore, PCO systems often have high commercial costs due to the cost of the UV bulbs, and it is desirable to find ways to decrease this cost component to further improve the competitiveness of the PCO technology.
  • Hybrid systems are needed, because T1O2, which is the most widely used photo catalyst for PCO systems, exhibits low adsorption ability, especially for non-polar substances due to its polar structure. Therefore, the low adsorption ability of non-porous T1O2 particles could be improved by making composites of T1O2 with adsorbents.
  • the adsorbents would adsorb the compounds on the adsorbent support, forming a high concentration environment of the compounds around the T1O2. This results in an increase in the photoreaction rate.
  • adsorbents such as zeolum, alumina, silica, mordenite, ferrierite, and activated carbon, and it was demonstrated in several studies that the hybrid photo cata- lysts were effective in achieving high decomposition rates of for instance propionalde- hyde in air. Not only T1O2, but also other photocatalysts such as ZnO were found to have higher photodegradation efficiency when used as a compound system with activated carbon as the adsorbent (see Mo, J., et al., Photocatalytic purification of volatile organic compounds in indoor air: A literature review. Atmospheric Environment, 2009. 43(14): p. 2229-2246).
  • the invention relates to an air cleaning system comprising: a hybrid photo catalyst arranged for photocatalytic oxidation of pollutants in air, said hybrid photo catalyst comprising a porous filter impregnated with photo catalyst material as well as adsorbent material, and a source of ultraviolet (UV) light arranged to periodically irradiate said hybrid photo catalyst in order to decompose said pollutants and to regenerate said adsorbent material.
  • a hybrid photo catalyst arranged for photocatalytic oxidation of pollutants in air, said hybrid photo catalyst comprising a porous filter impregnated with photo catalyst material as well as adsorbent material, and a source of ultraviolet (UV) light arranged to periodically irradiate said hybrid photo catalyst in order to decompose said pollutants and to regenerate said adsorbent material.
  • UV ultraviolet
  • the UV light source In a traditional PCO system consisting of a UV light source and photo catalyst material, the UV light source is in continuous operation, as adsorbed VOCs need to be removed continuously in order to ensure effective removal.
  • VOCs can be adsorbed up to a certain capacity. This allows for periodic operation of the UV light source, which ensures efficient utilization of the expensive UV lamp by decomposition of concentrated pollutants on hybrid photocatalyst surface thereby regenerating hybrid photocatalyst for further adsorption.
  • the UV light is used in a more efficient manner, as by VOCs adsorption, a high local concentration of VOCs on the hybrid PCO system is created, which then can be removed efficiently by UV.
  • PCO photocatalytic oxidation
  • a hybrid PCO and adsorption solution is proposed. The gist of the idea is a combined adsorbent/photo catalyst system to which the pollutants are continuously adsorbed and that the adsorbent is periodically regenerated by UV light.
  • the proposed solution advantageously has the following features to overcome the problems: ⁇ Sufficient adsorption capacity and effective mass transfer rate between gas phase and the adsorbent;
  • a system of panels with a deep porous filters (possibly resembling open filters used for automotive applications) impregnated with high surface area hybrid photocatalyst is proposed.
  • the photo catalyst is e.g. T1O2
  • the adsorbent is e.g. a zeolite
  • the deep filter media is e.g. quartz material.
  • the filter is relatively open in order to secure good penetration of UV light, which means that the filtration mechanism will be deep filtration in the filter media result- ing in low pressure drop.
  • This design allows for a high adsorption surface area, further making it possible to reduce the required photocatalyst area and to ensure a compact design.
  • the hybrid photocatalytic system deep filtration and effective adsorption has the possibility to allow for higher air flow rate, while still maintaining sufficient catalytic activity, due to the added adsorption capacity.
  • hybrid photocatalyst material is meant to denote a material comprising both a photocatalyst and an adsorbent.
  • the air cleaning system further comprises a particulate matter filter upstream of the hybrid photo catalyst.
  • a particulate matter filter is e.g. a coarse pre-filter that can be cleaned on a regular basis,
  • the air cleaning system further comprises a prefilter upstream of the particulate matter filter and/or the hybrid photo catalyst.
  • the prefilter is e.g. an electrostatically charged filter, an activated carbon filter, a particulate matter filter or a combination thereof.
  • An electrostatically charged filter is useful for particulate matter removals, an activated carbon filter for odour removal, and a particulate matter (PM) filter (e.g. HEPA, ULPA) is useful for reduction of the particulate matter (PM) before entering the hybrid PCO system.
  • PM particulate matter
  • the air cleaning system further comprises air conditioning equipment downstream the hybrid photo catalyst.
  • the air conditioning equipment e.g. comprises activated carbon equipment or filter to eliminate traces of interme- diate and unreacted pollutants and/or an ion generation unit to release ions to keep the air fresh.
  • the UV light irradiates said hybrid photo catalyst in less than 50% of the time, preferably less than 40% of the time, more preferably less than 25% of the time.
  • a source of UV light viz. a UV lamp is typically quite expensive; however, its lifetime depends on the number of operation hours.
  • a UV lamp is typically quite expensive; however, its lifetime depends on the number of operation hours.
  • the photo catalyst material comprises one or more of the following: Titanium dioxide (T1O2), zink oxide (ZnO), antimony trioxide (Sb20s), bismuth oxide (B12O3), vanadium oxide (V2O3), ferric oxide (Fe20s), zirconium dioxide (ZrC>2), tungsten trioxide (WO3), tin dioxide (SnC>2), aluminium oxide (AI2O3), cerium oxide (CeC>2), zinc sulphide (ZnS), cadmium sulphide (CdS), T1O2 doped with metal ions, T1O2 combined with ZrC>2 and/or silicon dioxide (S1O2).
  • the adsorbent material comprises activated carbon, zeolite, zeolum, alumina, silica, mordenite, ferrierite, clinoptilolite, ZSM-5.
  • Figure 1 a shows a schematic drawing of a system of the invention
  • Figures 1 b-1 d show two side views and a top view of an air cleaning unit
  • Figures 2a-2c show a typical operation cycle of the hybrid photo catalyst.
  • FIG 1 a shows a schematic drawing of an air cleaning system 100 of the invention.
  • the air cleaning system 100 comprises an air cleaning unit 20 comprising a hybrid photo catalyst arranged for photocatalytic oxidation of pollutants in air.
  • the hybrid photo catalyst comprises a porous filter 26 impregnated with photo catalyst material as well as adsorbent material.
  • the air cleaning unit 20 moreover comprises sources 22 of ultraviolet (UV) light arranged to periodically irradiate the hybrid photo catalyst in order to regenerate the adsorbent material.
  • the air cleaning system 20 comprises a number of UV lamps arranged to periodically irradiate a hybrid photo catalyst 26. In figure 1 , an array of two times two UV lamps is arranged within cylinders of hybrid photo catalyst 26.
  • the overall system 100 moreover comprises a PM filter 10, such as e.g. a HEPA or ULPA filter.
  • PM filter 10 such as e.g. a HEPA or ULPA filter.
  • further filters upstream the PM filter and/or upstream the air cleaning system 20 may be present, such as a pre-filter, for example an ESP filter.
  • the air cleaning system may comprise further air conditioning units downstream the air cleaning unit 20, such as an activated carbon filter to eliminate traces of intermediate and unreacted pollutants and/or an ion generator.
  • polluted air 1 enters the system 100.
  • the polluted air may already have undergone some purification in a pre-filter prior to entering the system 100.
  • the polluted air 1 reaches the HEPA or ULPA filter 10 for removal of particulate matter.
  • the resultant air 2 comprising VOCs/NOx , particulates and/or bioaerosols, from which the major part of particulate matter has been removed, is led to the air cleaning system 20 having a hybrid photo catalyst and adsorbent 26.
  • the air 2 enters the air cleaning system between hybrid photo catalyst or adsorbent 26 and UV lamps 22.
  • the adsorbent 26 adsorbs polluting compounds. Thereby a high concentration environment of the compounds is formed around the photocatalyst, e.g. T1O2, resulting in an increase in the photoreaction rate upon radiation with UV light.
  • the UV lamps 22 are turned on to irradiate the adsorbent with UV light, thereby regenerating the adsorbent.
  • FIG. 1 b-1 d show two side views and a top view of an air cleaning unit 20.
  • the side view of Figure 1 B is a view of the left end (as seen in figure 1 A) of the air cleaning unit 20, whilst the side view of Figure 1 B is a view of the right end (as seen in figure 1A) of the air cleaning unit 20 and figure 1 C is a top view of the air cleaning unit 20.
  • the air cleaning unit 20 has a front plate 21 (shown hatched) and four units, each comprising a UV lamp 22, surrounded by an annular space and a cylindrical hybrid photocatalyst 26 (shown as concentric circles in figure 1 b).
  • the number of units in an air cleaning unit can be any appropriate number, and that the diameter of the cylindrical hybrid photocatalyst 26 could be different than shown in the figures. If the diameter of the cylindrical photocatalyst 26 is somewhat larger, the total area of the front plate 21 would be smaller and the effective area of the air cleaning system would be increased.
  • FIG 1 c a side view of the end of the air cleaning unit 20 is shown.
  • the cylindrical photocatalyst 26 ends in a part 28, which is either not penetrable by air, or is made from hybrid photocatalyst material. Hereby, it is ensured that the air entering the air cleaning unit 20 has to pass through the hybrid photocatalyst material 26.
  • Struts or braces 27 support the end of the cylindrical hybrid photocatalyst 26 of the four units.
  • FIG 1 d a top view of the air cleaning unit 20 is shown.
  • air comprising pollutants is arranged to enter the air cleaning unit 20 from the left, and clean(ed) air is arranged to exit the air cleaning unit to the right or along the sides of the units, through the hybrid photocatalyst material 26.
  • the air cleaning unit 20 shown in figures 1 a-1 d is an open system, where the cleaned air exits through the walls of hybrid photocatalyst material 26 or from the ends 28 of the cylindrical hybrid photocatalyst. This is shown by the curved arrows in figure 1 d.
  • the system is a closed system where side walls enclose the hybrid photocatalyst material 26.
  • air to be cleaned enters into the annular space between the UV lamp 22 and the hybrid photocatalyst material 26 and exits the air cleaning unit via the end structure 25 or the end parts 28.
  • an end structure 25 comprising struts or braces 27 is shown.
  • the end structure 25 could alternatively be an end plate, which is impenetrable to gas, except from the end parts 28.
  • FIGs 2a to 2c show a typical regeneration cycle of a hybrid photocatalyst of an air cleaning system according to the invention.
  • FIGs 2a-2c only a small part of the hybrid photo catalyst 26 is shown.
  • the operation cycle includes three stages illustrated in the three figures.
  • the hybrid photocatalyst 26 has recently been regenerated and it is ready for adsorption of pollutants.
  • the photocatalyst 26 is shown with a few particles 4 of pollutants adsorbed on the surface thereof.
  • Air 2 comprising VOCs, NOx, particulates and/or bioaerosols is passed along the surface of the hybrid photocatalyst 26, and clean or cleaner air 3 leaves the photo- catalyst 26.
  • one or more sources of UV light are turned on to irradiate the hybrid photocatalyst 26 with UV light in order to decompose the adsorbed pollutants and thereby regenerate the hybrid photocatalyst.
  • the primary end products from the oxidation of VOCs, NOx, particulates and/or bioaerosols in the air 2 are CO2 and H2O. These primary end products are denoted by "7" in figure 2c.
  • the photocatalyst is ready for another cycle, starting with the first stage.
  • the UV source(s) is/are turned on simultaneously with an air flow passing along the surface of the photocatalyst 26.

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  • Chemical & Material Sciences (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Biomedical Technology (AREA)
  • General Chemical & Material Sciences (AREA)
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  • Catalysts (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)

Abstract

La présente invention concerne un système d'épuration d'air comprenant un photocatalyseur hybride agencé pour l'oxydation photocatalytique de polluants dans l'air, ledit photocatalyseur hybride comprenant un filtre poreux imprégné d'un matériau photocatalyseur ainsi qu'un matériau adsorbant, et une source de lumière ultraviolette (UV) agencée pour irradier périodiquement ledit photocatalyseur hybride afin de régénérer ledit matériau adsorbant. L'invention concerne en outre un procédé de fonctionnement d'un système d'épuration d'air de l'invention.
PCT/EP2016/071850 2015-09-29 2016-09-15 Système d'épuration d'air par oxydation photocatalytique WO2017055094A1 (fr)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108371883A (zh) * 2018-02-02 2018-08-07 河南师范大学 一种用于去除室内甲醛的空气净化喷雾剂及其制备方法
CN110152696A (zh) * 2018-02-08 2019-08-23 彭万喜 一种微环境污染治理的消化器
CN110302667A (zh) * 2019-07-25 2019-10-08 江苏中科睿赛环境工程有限公司 一种去除VOCs的高效可再生吸附光催化反应模块及其工作方法
CN112815413A (zh) * 2021-01-11 2021-05-18 北京华钛高科科技有限公司 一种空调风道杀菌消毒模块
DE102020101540A1 (de) 2020-01-23 2021-07-29 Kunststoff Helmbrechts Ag Verfahren zur Abluftreinigung
WO2021168280A1 (fr) * 2020-02-21 2021-08-26 Marelli North America, Inc. Système de purification d'air de véhicule avec filtration par photocatalyse
CN114053866A (zh) * 2021-11-16 2022-02-18 江苏富淼科技股份有限公司 一种固定床光催化反应器及其处理氯甲烷废气方法
US11406937B2 (en) 2019-05-17 2022-08-09 Calsonic Kansei North America, Inc. Photocatalytic filtration in vehicle HVAC system
WO2023041878A1 (fr) * 2021-09-20 2023-03-23 Uvgermi Dispositif d'épuration de fluide gazeux et utilisation d'un tel dispositif pour épurer l'air de l'habitacle d'un véhicule
US11612673B2 (en) 2020-08-31 2023-03-28 Promethium Limited Photoactivated semiconductor photocatalytic air purification
US11623018B2 (en) 2020-08-31 2023-04-11 Promethium Limited Photoactivated semiconductor photocatalytic air purification
WO2024042524A1 (fr) * 2022-08-23 2024-02-29 Quantum Holdings I.I. Ltd. Surfaces photoactives et systèmes les mettant en oeuvre

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996037281A1 (fr) * 1995-05-26 1996-11-28 Minnesota Mining And Manufacturing Company Filtre eliminant les odeurs, active par des uv et pouvant se placer sur un plan de travail
US20060127288A1 (en) * 2004-12-14 2006-06-15 Carrier Corporation Photocatalyst protection
US20110085933A1 (en) * 2009-10-13 2011-04-14 Sol-gel Solutions, LLC System and method for purifying air via low-energy, in-situ regenerated silica-titania composites

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996037281A1 (fr) * 1995-05-26 1996-11-28 Minnesota Mining And Manufacturing Company Filtre eliminant les odeurs, active par des uv et pouvant se placer sur un plan de travail
US20060127288A1 (en) * 2004-12-14 2006-06-15 Carrier Corporation Photocatalyst protection
US20110085933A1 (en) * 2009-10-13 2011-04-14 Sol-gel Solutions, LLC System and method for purifying air via low-energy, in-situ regenerated silica-titania composites

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108371883A (zh) * 2018-02-02 2018-08-07 河南师范大学 一种用于去除室内甲醛的空气净化喷雾剂及其制备方法
CN110152696A (zh) * 2018-02-08 2019-08-23 彭万喜 一种微环境污染治理的消化器
US11406937B2 (en) 2019-05-17 2022-08-09 Calsonic Kansei North America, Inc. Photocatalytic filtration in vehicle HVAC system
CN110302667A (zh) * 2019-07-25 2019-10-08 江苏中科睿赛环境工程有限公司 一种去除VOCs的高效可再生吸附光催化反应模块及其工作方法
DE102020101540A1 (de) 2020-01-23 2021-07-29 Kunststoff Helmbrechts Ag Verfahren zur Abluftreinigung
DE102020101540B4 (de) 2020-01-23 2023-12-14 Kunststoff Helmbrechts Ag Verfahren zur Abluftreinigung, sowie Plasmamodul, Agglomerationsmodul und UV-Behandlungsmodul zur Verwendung in einem derartigen Verfahren
WO2021168280A1 (fr) * 2020-02-21 2021-08-26 Marelli North America, Inc. Système de purification d'air de véhicule avec filtration par photocatalyse
US11612673B2 (en) 2020-08-31 2023-03-28 Promethium Limited Photoactivated semiconductor photocatalytic air purification
US11623018B2 (en) 2020-08-31 2023-04-11 Promethium Limited Photoactivated semiconductor photocatalytic air purification
CN112815413A (zh) * 2021-01-11 2021-05-18 北京华钛高科科技有限公司 一种空调风道杀菌消毒模块
WO2023041878A1 (fr) * 2021-09-20 2023-03-23 Uvgermi Dispositif d'épuration de fluide gazeux et utilisation d'un tel dispositif pour épurer l'air de l'habitacle d'un véhicule
CN114053866A (zh) * 2021-11-16 2022-02-18 江苏富淼科技股份有限公司 一种固定床光催化反应器及其处理氯甲烷废气方法
CN114053866B (zh) * 2021-11-16 2024-02-23 江苏富淼科技股份有限公司 一种固定床光催化反应器及其处理氯甲烷废气方法
WO2024042524A1 (fr) * 2022-08-23 2024-02-29 Quantum Holdings I.I. Ltd. Surfaces photoactives et systèmes les mettant en oeuvre

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